Re: [Discuss-gnuradio] About USRP's Bandwidth

[Marcus D. Leech]

On 08/11/2011 9:29 AM, 弓长张 wrote:
> I'm a starter in using the USRP, it's known that the bandwidth of USRP 
> is 8M beacause of the USB bandwidth ,my question is the 8M refers to 
> the Nquist Bandwith or the actual signal bandwidth?If it refers to the 
> Nquist Bandwith, it is mean that USRP can only process the signal with 
> 4M bandwidth,so if a signal larger than 4M, how can USRP deals with it ?
USRP use complex-baseband sampling, which allows you to "cheat" Nyquist. 
With complex sampling, the sample-rate == bandwidth.

With the very-latest UHD updates from Josh last night, 8-bit "wire 
format" samples are supported, which doubles the effective
bandwidth-to-the-host for all the USRP platforms, meaning that USRP1 and 
B100 can support 16Msps maximum, and USRP2/N2XX
can support 50Msps maximum. I'd like to see someone be able to "do 
something" with 50Msps into their host :-)